How many kilopascals is 1 mmHg?

1 millimeter of mercury (mmHg) equals approximately 0.133322 kilopascals (kPa). This comes from the exact SI definition: 1 mmHg = 133.322 Pa = 0.133322 kPa.

How do I convert mmHg to kPa manually?

Multiply the mmHg value by 0.133322. For example, 760 mmHg × 0.133322 = 101.325 kPa (standard atmosphere). To reverse, divide the kPa value by 0.133322.

What is normal blood pressure in kPa?

Normal systolic blood pressure is about 120 mmHg, which equals 120 × 0.133322 ≈ 16.0 kPa. Diastolic is about 80 mmHg ≈ 10.7 kPa. Most clinical practice outside the US still reports in mmHg, but some European guidelines use kPa.

What is the difference between mmHg and Torr?

mmHg and Torr are nearly identical. 1 Torr is defined as exactly 1/760 of a standard atmosphere, giving 1 Torr = 133.322 Pa. 1 mmHg = 133.3224 Pa. The difference is less than 0.000015%, so they are interchangeable for all practical purposes.

Why is mmHg still used for blood pressure?

mmHg became the medical standard in the 19th century because sphygmomanometers (blood pressure cuffs) used mercury columns. The SI unit kPa was never widely adopted in clinical settings, so mmHg persists for blood pressure and eye pressure by convention worldwide.

How do I convert 760 mmHg to kPa?

760 mmHg × 0.133322 = 101.325 kPa, which is exactly 1 standard atmosphere. This is the air pressure at sea level under standard conditions.

mmHg to Kilopascals Converter

Name: mmHg to Kilopascals Converter
Availability: InStock
Author: Nham Vu

Enter a pressure in mmHg and instantly get kilopascals plus bar, psi, and atm equivalents.

Converter

Pressure in mmHg

Kilopascals (kPa)

Bar

PSI

Atm

Reverse: kPa to mmHg

Pressure in kPa

Result in mmHg

Reference Table

mmHg kPa

1 mmHg 0.13332

10 mmHg 1.3332

25 mmHg 3.333

80 mmHg 10.666

100 mmHg 13.332

120 mmHg 15.999

200 mmHg 26.664

300 mmHg 39.997

500 mmHg 66.661

760 mmHg 101.325

1000 mmHg 133.322

1500 mmHg 199.983

Formula: kPa = mmHg × 0.133322

Summary

Enter a pressure in mmHg and instantly get kilopascals plus bar, psi, and atm equivalents.

How it works

Enter the pressure value in mmHg in the top input field.
The kPa result appears instantly with no button press needed.
The bar, psi, and atm equivalents update at the same time.
Use the reverse field to convert kPa back to mmHg.
Click "Copy" next to any result to copy it to your clipboard.
Check the reference table for common mmHg-to-kPa values.

Use cases

Convert blood pressure readings from mmHg to kPa for medical documentation in kPa-standard regions.
Translate barometric pressure from mmHg to kPa for weather data APIs.
Convert vacuum pump specs from mmHg to kPa when sourcing equipment.
Check eye pressure (intraocular pressure) values across mmHg and kPa reports.
Translate gas cylinder pressures between mmHg and kPa for lab use.
Convert altitude pressure data expressed in mmHg to SI-standard kPa.
Verify HVAC system pressures reported in mmHg against kPa spec sheets.
Cross-reference old mercury manometer readings with modern kPa instruments.

Frequently Asked Questions

Last updated: 2026-07-23 · Reviewed by Nham Vu